Going + 16GB on top of 27's 8GB original?

It really is up to you.

The iMac core i5 & i7 chipsets support dual-channel memory--not triple-channel. When you open your memory access panel, you will see that the two SODIMM are in staggered slots.

Whatever matched pairing memory you order, you will install that pair in the open slots, and you're good to go.

I did opt for and went with the 32GB option. I couldn't be happier . . . well . . . if my 3TB Fusion drive were a 3TB SSD, I'd be happier, but only if someone else paid for it.

shenan1982 said:

So I have the 27" iMac 27" on it's way. I went with the 8GB standard (plus fusion). My initial impression is that the computer only takes 2 RAM cards, but now I understand it'll take 4.

Am I ok to just add the 2x8GB Crucial to the existing 2x4GB, or am I better removing the 2x4GB and keeping the RAM all the same, or possibly ordering another 2x8GB kit to have 32GB total?

Thanks!

Click to expand...

Yes, you can have 2x4GB plus 2x8GB in the system.

And whatever you decide, you need to hold on the original Apple memory for certain AppleCare issues. The most important is if they decide to replace your system for some reason.

shenan1982 said:

So I have the 27" iMac 27" on it's way. I went with the 8GB standard (plus fusion). My initial impression is that the computer only takes 2 RAM cards, but now I understand it'll take 4.

Am I ok to just add the 2x8GB Crucial to the existing 2x4GB, or am I better removing the 2x4GB and keeping the RAM all the same, or possibly ordering another 2x8GB kit to have 32GB total?

Thanks!

Click to expand...

Yep, that is what I did. Love my iMac.